1. Department of Maternal and Child Health; School of Public Health; Sun Yat-sen University; Guangzhou China
2. Johns Hopkins Global Center on Childhood Obesity; Department of International Health; Bloomberg School of Public Health; Baltimore MD USA
3. Department of Health, Behavior and Society; Johns Hopkins Bloomberg School of Public Health; Baltimore MD USA
4. Johns Hopkins University Evidence-Based Practice Center; Baltimore MD USA
5. Department of Health Policy and Management; Johns Hopkins Bloomberg School of Public Health; Baltimore MD USA
6. Department of Epidemiology and Environmental Health; School of Public Health and Health Professions; University at Buffalo; State University of New York; Buffalo NY USA